US20130233620A1 - Stabilizer with Drilling Fluid Diverting Ports - Google Patents
Stabilizer with Drilling Fluid Diverting Ports Download PDFInfo
- Publication number
- US20130233620A1 US20130233620A1 US13/794,098 US201313794098A US2013233620A1 US 20130233620 A1 US20130233620 A1 US 20130233620A1 US 201313794098 A US201313794098 A US 201313794098A US 2013233620 A1 US2013233620 A1 US 2013233620A1
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- nozzle
- blades
- drill string
- sub
- diverting
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- 239000012530 fluid Substances 0.000 title claims abstract description 99
- 238000005553 drilling Methods 0.000 title claims abstract description 82
- 239000003381 stabilizer Substances 0.000 title claims description 41
- 238000000034 method Methods 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims description 3
- 230000001747 exhibiting effect Effects 0.000 claims description 2
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 238000009825 accumulation Methods 0.000 abstract description 2
- 230000000087 stabilizing effect Effects 0.000 abstract description 2
- 238000005520 cutting process Methods 0.000 description 16
- 230000015572 biosynthetic process Effects 0.000 description 6
- 238000005755 formation reaction Methods 0.000 description 6
- 239000013049 sediment Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 230000001186 cumulative effect Effects 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/10—Valve arrangements in drilling-fluid circulation systems
- E21B21/103—Down-hole by-pass valve arrangements, i.e. between the inside of the drill string and the annulus
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
- E21B17/1078—Stabilisers or centralisers for casing, tubing or drill pipes
Definitions
- Oil and gas wells are typically drilled with a drill string having a drill bit on bottom that is rotated.
- One type of drill bit is a drag bit having blades with cutting disks that scrape against and cut the formation.
- Mud pumps on a drilling rig pump drilling fluid down the drill string and out nozzles on the bit face to sweep formation cuttings from the bit face. The drilling fluid entrains the cuttings and returns up an annulus surrounding the drill string.
- a mud motor may be provided in the drill string to rotate the drill bit. Drilling fluid pressure powers the mud motor to rotate the drill bit independently of the drill string rotation. The mud motor requires a considerable pressure and flow rate of drilling fluid in order to be able to apply the desired torque to the drill bit.
- Drill bits may also plug and ball up while drilling sticky shale formations. If the mud motor is not able to rotate the drill bit at a desired rotational speed, the rate of penetration may decline. Many variations in the bit nozzle diameters, orientation and placement are used in order to more effectively remove cuttings.
- Drilling subs are provided in a drill string that include diverting fluid passages extending between an interior and exterior thereof. A portion of the drilling fluid being pumped downward through the interior of the drill string is diverted through the passages such that additional turbulence is produced in the flow of the drilling fluid returning upward in the annulus around the drill string. The additional turbulence may dislodge accumulated sediments, e.g., from between stabilizer blades, or prevent the sediment from precipitating from the drilling fluid.
- an apparatus for facilitating the return of drilling fluid through an annulus surrounding a drill string includes a longitudinal body defining an upper end, a lower end and a longitudinal axis extending therebetween.
- the upper and lower ends include connectors for connecting the longitudinal body into the drill string.
- An interior axial passage extends between the upper and lower ends of the longitudinal body for conveying drilling fluid through the longitudinal body.
- a plurality radially spaced blades are provided that protrude from an exterior surface of the longitudinal body and define open exterior flow channels therebetween.
- a plurality of radially spaced diverting nozzle passages extends between the inner axial passage and the exterior surface of the longitudinal body. The diverting nozzle passages terminate in nozzle openings exhibiting a radial spacing corresponding to a radial spacing of the exterior flow channels. Drilling fluid discharged from the diverting nozzle passages is directed toward the exterior flow channels.
- a wed drilling apparatus includes a body defining a longitudinal body axis, and having a threaded upper end for connection into a drill string and a threaded lower end for connection and rogation with an earth boring bit.
- An axial passage is provided in the body for conveying drilling fluid to an outlet in the earth boring bit.
- a plurality of blades extend radially outward from an exterior surface of the body, and are radially spaced to define exterior flow channels therebetween. The plurality of blades is configured for engaging a wall of a borehole formed by the earth boring bit.
- a plurality of nozzles outlets is defined on the exterior surface of the body and in fluidic communication with the axial passage. Each of the nozzle outlets has a longitudinal position along the body between upper and lower ends of the radially spaced blades.
- FIG. 1 is a side elevational and partly sectioned view of a drill string having a drilling fluid diverting sub in accordance with this disclosure.
- FIG. 2 is a vertical sectional view of the drilling fluid diverting sub of FIG. 1 .
- FIG. 3 is a horizontal sectional view of the drilling fluid diverting sub of FIG. 1 , taken along the line 3 - 3 of FIG. 1 .
- FIG. 4 is a perspective view of one of the nozzles of the drilling fluid diverting sub of FIG. 1 .
- FIG. 5 is a perspective view of the nozzle of FIG. 4 , as seen from a different view point.
- FIG. 6 is a sectional view of the nozzle of FIGS. 4 and 5 .
- FIG. 7 is a perspective view of an alternate embodiment of the drilling fluid diverting sub of FIG. 1 .
- FIG. 8 is an exploded side view of a stabilizer with a fluid diverting sub.
- FIG. 9 is a side view of the stabilizer of FIG. 8 secured to the fluid diverting sub.
- FIG. 10 is a side view of the stabilizer and sub of FIG. 9 connected into a drill string.
- FIG. 11 is a side view of a stabilizer having integral fluid diverting nozzles.
- FIG. 12 is a side view of three of the stabilizers of FIG. 11 connected into a drill string.
- drill string 13 includes a mud motor 15 , which is a conventional component.
- Mud motor 15 typically has blades or stabilizers 17 extending from its outer side.
- a drilling fluid or drilling mud diverting sub 19 is secured to the lower end of mud motor 15 .
- Sub 19 has diverting nozzles 21 in its side wall that have outlets pointing outward and upward.
- Sub 19 may be joined to an upper end 23 of a conventional earth boring device or bit 25 .
- bit 25 is a drag bit having cutting blades 27 extending from a circumference to a lower side or face. Blades 27 have cutting elements 29 mounted thereto for scraping the earth formation as bit 25 rotates. Cutting elements 29 may be formed of a polycrystalline diamond or other materials. Bit 25 also has at least one, and normally several outlets or bit nozzles 31 on its face. Bit outlets 31 receive drilling fluid pumped into a central cavity of bit 25 and discharge the drilling fluid at various angles relative to the face of bit 25 . The discharged drilling fluid entrains cuttings of the earth formation and flows up an annulus surrounding drill string 13 .
- an axial or vertical plane 49 is illustrated as emanating from and containing longitudinal axis 43 and also passing through the center of the outlet of each nozzle 21 .
- nozzle axis 47 is not located within axial plane 49 , rather it intersects axial plane 49 at the outlet of nozzle 21 .
- the angular difference between nozzle axis 47 and axial plane 49 is referred to herein as an oblique angle and indicated by the numerals 51 , 53 and 55 for nozzles 21 a , 21 b and 21 c , respectively.
- a vertical plane containing nozzle axis 47 would not be normal to the cylindrical exterior of body 35 .
- Nozzle axis 47 thus is oblique to the cylindrical exterior of body 35 , in addition to pointing upward and outward. Considering the direction of rotation, which is clockwise looking down as shown by the arrow, each nozzle axis 47 lags axial plane 49 .
- oblique angle 51 for nozzle 21 a is less than oblique angle 53 for nozzle 21 b , which in turn may be less than oblique angle 55 for nozzle 21 c .
- oblique angle 51 is 10 degrees
- oblique 53 is 20 degrees
- oblique angle 55 is 30 degrees.
- Different oblique angles may be employed. Further, it is not essential that each oblique angle differ; rather one oblique angle could differ from only one other oblique angle or all of the oblique angles may be the same.
- each nozzle 21 is at a different elevation than the others.
- nozzle 21 a is the lowest, or closest to drill bit 25 .
- Nozzle 21 b is farther from drill bit 25 than nozzle 21 a .
- Nozzle 21 c is farther from drill bit 25 than nozzle 21 c .
- the difference is distance to drill bit 25 can vary. In one example, the difference is about 3 ⁇ 8 inch from nozzle 21 a to nozzle 21 b and the same amount form nozzle 21 b to nozzle 21 c .
- the lowest nozzle, which is nozzle 21 a may have the smallest oblique angle 51 , as shown in FIG. 3 . It is not essential that the elevations for each nozzle 21 differ.
- the distance to bit 25 may differ between only two of the nozzles 21 , or all of the elevations could be the same.
- a check valve 57 may optionally be inserted into an upper portion of axial passage 41 .
- Check valve 57 may be of various types.
- a check valve element is biased by a spring 59 against a seat in a cartridge 61 .
- Cartridge 61 rests on a shoulder in the upper portion of axial passage 41 , which is slightly larger in diameter than the central portion that is intersected by nozzle passages 45 .
- Check valve 57 allows down flow of fluid in axial passage 41 , but blocks upward blow.
- check valve 53 resists silt and cuttings from passing upward through bit outlets 31 to mud motor 15 , where damage may occur.
- each nozzle 21 may have helical grooves 63 formed in its bore or outlet 64 . Grooves 63 spiral from one end to the other of outlet 64 . The helical angle may vary. Also, FIG. 4 shows that the outer end of each nozzle 21 may have a conical recess 65 that diverges outward. Each nozzle 21 has an O-ring seal groove 67 on its outer diameter for sealing within nozzle passage 45 ( FIG. 2 ). Nozzles 21 may be retained in various conventional manners. A retainer ring shoulder 69 receives a snap ring to retain nozzle 21 in this example.
- substantially the entire exterior of fluid diverting sub 19 ′ may have protrusions or dimples 71 formed therein. Dimples 71 serve to enhance turbulence of drilling fluid flowing past sub 19 ′.
- fluid diverting sub 19 is secured into drill string 13 between drill bit 25 and mud motor 15 .
- fluid diverting sub 19 may form an upper part of drill bit 25 . If the operator wishes to test mud motor 15 before lowering the string into well bore 11 , and if fluid diverting sub 19 is connected between mud motor 15 and drill bit 25 , the operator will install blank plugs in nozzle passages 45 in place of nozzles 21 . The blank plugs allow the operator to pump drilling fluid through mud motor 15 and out bit outlets 31 to test whether mud motor 15 properly rotates drill bit 25 .
- the operator installs nozzles 21 in fluid diverting sub 19 .
- the operator can select different diameters for the bores of diverting nozzles 21 so as to create a desired flow area ratio to the bit nozzles or outlets 31 .
- the total flow areas of the diverting nozzles 21 will be fairly small relative to the total flow areas of the bit outlets 31 .
- the cumulative diverting nozzle flow area will be only 10 to 20 percent of the cumulative flow area of bit outlets 31 .
- the operator lowers the drill string 13 into well bore 11 .
- the operator rotates drill bit 25 to begin drilling while also pumping drilling fluid down drill string 13 .
- Blades or stabilizers 17 engage a wall of the well bore 11 to stabilize the drill string 13 .
- the operator can rotate drill bit 25 by rotating drill string 13 from the drilling rig.
- the operator can also hold drill string 13 stationary, and the drilling fluid flowing through mud motor 15 will rotate drill bit 25 and fluid diverting sub 19 in unison with each other.
- Mud motor 15 is optional for certain drilling operations, such as vertical portions of the well. In those instances, mud motor 15 may be eliminated and fluid diverting sub 19 may connect to a lower end of drill string 13 , such as the drill collars.
- the drilling fluid flows into bit cavity 33 and out bit outlets 31 .
- the drilling fluid returns back up the annulus surrounding drill string 13 , bringing earth formation cuttings.
- a portion of the drilling fluid is diverted out through diverting nozzles 21 .
- the upward and outward directed drilling fluid mixes with the returning drilling fluid discharged from bit outlets 31 , creating turbulence and enhancing the retention of cuttings in the flow stream.
- the jets of drilling fluid exiting fluid diverting nozzles 21 will swirl due to the helical grooves 63 ( FIG. 4 ).
- stabilizer sub 73 has a tubular body 75 for connection into a drill string.
- Tabular body 75 defines a longitudinal axis 76 that extends through an interior axial passage (see FIG. 2 ) provided for conveying drilling fluid through the tubular body 75 .
- Blades 77 are secured of formed on the exterior of body 75 for engaging a borehole wall for stabilizing a drill string.
- Blades 77 are radially spaced and protrude radially form an exterior surface of body 75 such that open exterior flow channels 77 ′ are defined between the blades 77 .
- Blades 77 may be inclined relative to the axis 76 , as shown in FIGS. 8-10 , or they may be parallel to the axis 76 , as illustrated in FIG. 1 .
- Blades 77 may be straight or curved.
- Stabilizer sub 73 has an internally threaded box or upper end 78 for connection to a drill string member.
- stabilizer sub 73 also has an internally threaded box or lower end 79 that is located a short distance from the lower ends of blades 77 .
- the lower ends of blades 77 are all located the same distance above the lower end 79 of body 75 in this example.
- the upper ends of blades 77 are all located the same distance below upper end 78 .
- the distance from lower end 79 to the lower ends of blades 77 is shown much smaller than the distance from the upper ends of blades 77 to upper end 78 , but the distances could be the same.
- a fluid diverting sub 81 has a tubular body 83 with a plurality of fluid diverting ports or nozzle outlets 85 .
- Tubular body 83 defines a longitudinal axis 84 that extends through an interior axial passage (see FIG. 2 ) provided for conveying drilling fluid through the tubular body 83 .
- Nozzle outlets 85 are in fluid communication with the interior axial passage through a Respective fluid diverting nozzle passage (see FIG. 2 ) and point upward and outward to discharge a portion of the drilling fluid being pumped down the drill string.
- Nozzle outlets 85 may be constructed and oriented the same as nozzles 21 a , 21 b and 21 c in FIG. 1 .
- Three or more nozzle outlets 85 are preferably used in sub body 83 .
- Sub body 83 has an upper externally threaded pin 87 that secures to the internally threaded lower end 79 of stabilizer sub 73 .
- Sub body 83 has a lower externally threaded pin 89 that secures to another component of the drill string.
- Flats 91 may be formed on the exterior of sub body 83 for engagement by a wrench to apply torque to secure sub 81 to stabilizer sub 73 .
- Stabilizer sub 73 may be formed by cutting off the lower threaded pin of a commercially available stabilizer and machining an internally threaded lower end 79 .
- assembly 92 of FIG. 9 could be integrally formed from a single tubular body.
- a radially spacing of the nozzle outlets 85 and corresponding diverting nozzle passages may correspond the radial spacing exhibited by the exterior flow channels 77 ′ such that drilling fluid discharged from the nozzle outlets 85 is directed toward the exterior flow channels 77 ′ in some embodiments. Discharging drilling fluid from the nozzle outlets 85 and directing the discharged drilling fluid through the exterior flow channels 77 ′ facilitates the return of drilling fluid at least by dislodging debris or sediments that accumulates between the blades 77 .
- each of the nozzle outlets 85 defines a nozzle axis that points upward and outward and also at an oblique angle relative to a vertical plane of the body axis that intersects the nozzle axis at the nozzle outlet in a manner similar to nozzles 21 described above with reference to FIGS. 2 and 3 .
- the plurality of blades 77 are inclined, in some embodiments with respect to the longitudinal axes 76 , 84 in the direction of the oblique angle of the nozzle outlets 85 .
- Drill bit 93 is secured to a fluid diverting sub 95 having nozzles 96 that may be the same as fluid diverting sub 19 of FIG. 1 .
- a mud motor 97 which may the same as mud motor 15 , except it may lack stabilizer blades, may be secured to the upper end of fluid diverting sub 95 .
- Fluid diverting sub 95 may have a float or check valve similar to valve 37 ( FIG. 2 ) to impede debris from flowing into mud motor 97 when the drill string is being lowered into the borehole.
- Other tubular members such as a drill pipe or drill collar may be provided in addition to or as an alternative to mud motor 97 in some embodiments.
- some of the drilling fluid being pumped down the drill string diverts out stabilizer sub nozzle outlets 85 to enhance flow of fluid and cuttings between blades 77 .
- the discharged fluid retards cuttings and debris packing between blades 77 keeping the exterior flow channels 77 ′ relatively clear.
- the proximity of the nozzle outlets 85 to the flow channels 77 ′ allows the fluid discharged from the nozzle outlets to retain sufficient energy to clean the channels 77 ′.
- the velocity and force of the fluid discharged from the nozzles 85 facilitates cleaning of the channels 77 ′ by generating turbulence in the annular flow of drilling fluid returning to the surface.
- stabilizer 99 has a tubular body 101 defining a longitudinal axis 102 .
- An interior axial passage extends through the tubular body 101 for conveying drilling fluid therethrough.
- the stabilizer 99 includes blades 103 that may be the same as blades 77 of FIG. 8 .
- Exterior flow channels 103 ′ are defined between the blades 103 .
- the axial lengths of blades 103 are much closer to the overall length of body 101 than the lengths of blades 77 relative to body 75 of FIG. 8 .
- a number of ports or nozzle outlets 105 are formed in an exterior surface of body 101 .
- the nozzle outlets 105 are in fluid communication with the interior axial passage through a respective fluid diverting nozzle passage (see FIG. 2 ). Nozzle outlets 105 may be constructed and positioned relative to each other in the same manner as nozzles 21 of FIG. 1 . Each of the nozzle outlets 105 is longitudinally positioned between upper and lower ends of blades 103 . Optionally a nozzle outlet 105 may be located between each of the blades 103 . As illustrated in FIG. 12 , a lowermost nozzle outlet 105 a may be disposed between two blades 103 near the lower ends of blades 103 . A next upward nozzle outlet 105 b may be located between two blades 103 about midway along the longitudinal lengths of blades 103 . An uppermost nozzle outlet 105 c may be located between two of the blades 103 near the upper ends of blades 103 . More than three nozzles 105 may be employed.
- Stabilizer 99 is illustrated as having an internally threaded lower end or box 107 .
- Stabilizer 99 may have an externally threaded upper end or pin 109 .
- the upper ends of blades 103 are quite close to the base of upper threaded end 109 , such as less than two inches.
- the Lower ends of blades 103 may also be less than two inches from internally threaded lower end 107 .
- FIG. 12 illustrates one arrangement where stabilizers 99 may be utilized in a drill string.
- Internally threaded lower end 107 of a lowermost stabilizer 99 a is secured to the external threaded pin of a bit 111 .
- One or more drill collars 113 extend upward from lowermost stabilizer 99 b .
- Drill collars 113 are sections of drill pipe with a greater weight and wall thickness than the remaining sections of drill pipe.
- a next upward stabilizer 99 b secures to the upper end of the drill collar or collars 113 connected to stabilizer 99 a .
- An adapter can connect between lower internally threaded end 107 ( FIG. 11 ) and the upper box end of drill collars 113 .
- stabilizer 99 could be manufactured with an integral threaded pin on the lower end, similar to pin 89 of diverter sub 81 ( FIG. 8 ).
- FIG. 12 also shows another stabilizer 99 c mounted to drill collars 113 extending upward from stabilizer 99 b .
- Stabilizer 99 c may be constructed the same as stabilizers 99 a and 99 b . Fewer or more stabilizers 99 than three may be used.
- a mud motor isn't used, but it could be.
- a mud motor may be provided in the drill string tin the place of one of the drill collars 113 .
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Abstract
Described are drilling subs that may be connected in a drill string for reducing the accumulation of debris on the exterior of the drill string or otherwise facilitating the return of drilling fluid during drilling operations. A plurality of radially spaced stabilizing blades protrude from an exterior surface of the drilling subs to define exterior flow channels therebetween through which drilling fluid returning to the surface may is directed. Diverting nozzle passages are provided that extend between an inner axial passage of the drilling subs and the exterior surface of the drilling subs. The diverting nozzle passages exhibit a radial spacing corresponding to a radial spacing of the exterior flow channels such that drilling fluid discharged from the diverting nozzle passages is directed toward the exterior flow channels.
Description
- This application claims priority to and the benefit of co-pending U.S. Provisional Application 61/608,755, filed Mar. 9, 2012. This application also claims priority to and the benefit of co-pending U.S. application Ser. No. 13/341,991, filed Dec. 30, 2011, which claims priority to U.S. Provisional Application 61/430,877, filed Jan. 7, 2011. The full disclosure of each of these applications is hereby incorporated by reference herein for all purposes.
- 1. Field of the Invention
- This application relates to earth boring operations, and in particular to upward and outward pointing drilling fluid diverting nozzles located in a drill string above a drill bit.
- 2. Description of the Related Art
- Oil and gas wells are typically drilled with a drill string having a drill bit on bottom that is rotated. One type of drill bit is a drag bit having blades with cutting disks that scrape against and cut the formation. Mud pumps on a drilling rig pump drilling fluid down the drill string and out nozzles on the bit face to sweep formation cuttings from the bit face. The drilling fluid entrains the cuttings and returns up an annulus surrounding the drill string. Particularly for horizontal wells, a mud motor may be provided in the drill string to rotate the drill bit. Drilling fluid pressure powers the mud motor to rotate the drill bit independently of the drill string rotation. The mud motor requires a considerable pressure and flow rate of drilling fluid in order to be able to apply the desired torque to the drill bit.
- If the cuttings are not readily removed, the rate of penetration of the drill bit into the earth declines. Drill bits may also plug and ball up while drilling sticky shale formations. If the mud motor is not able to rotate the drill bit at a desired rotational speed, the rate of penetration may decline. Many variations in the bit nozzle diameters, orientation and placement are used in order to more effectively remove cuttings.
- Described herein are methods and apparatuses for reducing and/or preventing the accumulation of cuttings or other debris on a drill string during drilling operations. Drilling subs are provided in a drill string that include diverting fluid passages extending between an interior and exterior thereof. A portion of the drilling fluid being pumped downward through the interior of the drill string is diverted through the passages such that additional turbulence is produced in the flow of the drilling fluid returning upward in the annulus around the drill string. The additional turbulence may dislodge accumulated sediments, e.g., from between stabilizer blades, or prevent the sediment from precipitating from the drilling fluid.
- According to one aspect of the disclosure, an apparatus for facilitating the return of drilling fluid through an annulus surrounding a drill string includes a longitudinal body defining an upper end, a lower end and a longitudinal axis extending therebetween. The upper and lower ends include connectors for connecting the longitudinal body into the drill string. An interior axial passage extends between the upper and lower ends of the longitudinal body for conveying drilling fluid through the longitudinal body. A plurality radially spaced blades are provided that protrude from an exterior surface of the longitudinal body and define open exterior flow channels therebetween. A plurality of radially spaced diverting nozzle passages extends between the inner axial passage and the exterior surface of the longitudinal body. The diverting nozzle passages terminate in nozzle openings exhibiting a radial spacing corresponding to a radial spacing of the exterior flow channels. Drilling fluid discharged from the diverting nozzle passages is directed toward the exterior flow channels.
- According to another aspect of the disclosure, a wed drilling apparatus includes a body defining a longitudinal body axis, and having a threaded upper end for connection into a drill string and a threaded lower end for connection and rogation with an earth boring bit. An axial passage is provided in the body for conveying drilling fluid to an outlet in the earth boring bit. A plurality of blades extend radially outward from an exterior surface of the body, and are radially spaced to define exterior flow channels therebetween. The plurality of blades is configured for engaging a wall of a borehole formed by the earth boring bit. A plurality of nozzles outlets is defined on the exterior surface of the body and in fluidic communication with the axial passage. Each of the nozzle outlets has a longitudinal position along the body between upper and lower ends of the radially spaced blades.
- According to another aspect of the disclosure, a method of drilling a well includes the steps of: (a) providing a drill string having an earth boring device at a lower end thereof, wherein the drill string has a body coupled therein, and wherein the body defines a longitudinal axis and includes a plurality of blades extending radially outward from an exterior surface of the body, and wherein the body further includes a plurality of nozzle outlets defined on the exterior surface of the body between the blades, and an axial passage extending through the body and in fluidic communication with each of the nozzle outlets; (b) lowering the drill string into the well and rotating the earth boring device; (c) pumping drilling fluid down the drill string into the axial passage of the body, and conveying a first portion of the drilling fluid through the axial passage and discharging the first portion of the drilling fluid through an outlet defined in the earth boring device into an annulus surrounding the drill string; and (d) diverting and discharging a second portion of the drilling fluid from the axial passage in the body through plurality of nozzle outlets into the annulus.
-
FIG. 1 is a side elevational and partly sectioned view of a drill string having a drilling fluid diverting sub in accordance with this disclosure. -
FIG. 2 is a vertical sectional view of the drilling fluid diverting sub ofFIG. 1 . -
FIG. 3 is a horizontal sectional view of the drilling fluid diverting sub ofFIG. 1 , taken along the line 3-3 ofFIG. 1 . -
FIG. 4 is a perspective view of one of the nozzles of the drilling fluid diverting sub ofFIG. 1 . -
FIG. 5 is a perspective view of the nozzle ofFIG. 4 , as seen from a different view point. -
FIG. 6 is a sectional view of the nozzle ofFIGS. 4 and 5 . -
FIG. 7 is a perspective view of an alternate embodiment of the drilling fluid diverting sub ofFIG. 1 . -
FIG. 8 is an exploded side view of a stabilizer with a fluid diverting sub. -
FIG. 9 is a side view of the stabilizer ofFIG. 8 secured to the fluid diverting sub. -
FIG. 10 is a side view of the stabilizer and sub ofFIG. 9 connected into a drill string. -
FIG. 11 is a side view of a stabilizer having integral fluid diverting nozzles. -
FIG. 12 is a side view of three of the stabilizers ofFIG. 11 connected into a drill string. - Referring to
FIG. 1 , awell bore 11 is illustrated being drilled by adrill string 13. Although wellbore 11 is shown as being vertical, often it will have a horizontal portion. In this example,drill string 13 includes amud motor 15, which is a conventional component.Mud motor 15 typically has blades orstabilizers 17 extending from its outer side. A drilling fluid or drillingmud diverting sub 19 is secured to the lower end ofmud motor 15.Sub 19 has divertingnozzles 21 in its side wall that have outlets pointing outward and upward.Sub 19 may be joined to anupper end 23 of a conventional earth boring device orbit 25. - In this example,
bit 25 is a drag bit havingcutting blades 27 extending from a circumference to a lower side or face.Blades 27 have cuttingelements 29 mounted thereto for scraping the earth formation asbit 25 rotates.Cutting elements 29 may be formed of a polycrystalline diamond or other materials.Bit 25 also has at least one, and normally several outlets or bit nozzles 31 on its face. Bit outlets 31 receive drilling fluid pumped into a central cavity ofbit 25 and discharge the drilling fluid at various angles relative to the face ofbit 25. The discharged drilling fluid entrains cuttings of the earth formation and flows up an annulus surroundingdrill string 13. - Drilling
fluid diverting nozzles 21 insub 19 discharge a portion of the drilling fluid being pumped downdrill string 13 before the drilling fluid reachesbit 25. The flow fromnozzles 21 joins the fluid stream of drilling fluid being pumped out of bit nozzles 31. In this embodiment, there are three fluid divertingnozzles 21, these being nozzle 21 a, nozzle 21 b, andnozzle 21 c.Nozzles 21 a, 21 b and 21 c are equally spaced around the side wall ofsub 19, 120 degrees apart front each other. More orfewer nozzles 21 is feasible. - Referring to
FIG. 2 ,sub 19 has atubular body 35 with a threadedupper end 37 for securing to a threaded lower end of mud motor 15 (FIG. 1 ).Sub 19 may also have a threadedlower end 39 for securing to threadedupper end 23 ofbit 25. Alternately, sub 19 could be integrally formed with and be a part of bitupper end 23. An interioraxial passage 41 extends throughsub body 35 along alongitudinal axis 43. For eachnozzle 21, a divertingnozzle passage 45 joinsaxial passage 41 and extends upward and outward along anozzle axis 47 to the exterior ofsub body 35. In this example,nozzle axis 47 is oriented upward about 45 degrees, but different angles are feasible. - Referring to
FIG. 3 , an axial orvertical plane 49 is illustrated as emanating from and containinglongitudinal axis 43 and also passing through the center of the outlet of eachnozzle 21. In thisembodiment nozzle axis 47 is not located withinaxial plane 49, rather it intersectsaxial plane 49 at the outlet ofnozzle 21. The angular difference betweennozzle axis 47 andaxial plane 49 is referred to herein as an oblique angle and indicated by thenumerals nozzles 21 a, 21 b and 21 c, respectively. Unlikeaxial plane 49, a vertical plane containingnozzle axis 47 would not be normal to the cylindrical exterior ofbody 35.Nozzle axis 47 thus is oblique to the cylindrical exterior ofbody 35, in addition to pointing upward and outward. Considering the direction of rotation, which is clockwise looking down as shown by the arrow, eachnozzle axis 47 lagsaxial plane 49. - In this embodiment, oblique angle 51 for nozzle 21 a is less than
oblique angle 53 for nozzle 21 b, which in turn may be less thanoblique angle 55 fornozzle 21 c. In one example, oblique angle 51 is 10 degrees,oblique 53 is 20 degrees, andoblique angle 55 is 30 degrees. Different oblique angles may be employed. Further, it is not essential that each oblique angle differ; rather one oblique angle could differ from only one other oblique angle or all of the oblique angles may be the same. - Also, in this embodiment, each
nozzle 21 is at a different elevation than the others. For example, as shown inFIG. 1 , nozzle 21 a is the lowest, or closest to drillbit 25. Nozzle 21 b is farther fromdrill bit 25 than nozzle 21 a.Nozzle 21 c is farther fromdrill bit 25 thannozzle 21 c. The difference is distance to drillbit 25 can vary. In one example, the difference is about ⅜ inch from nozzle 21 a to nozzle 21 b and the same amount form nozzle 21 b tonozzle 21 c. The lowest nozzle, which is nozzle 21 a, may have the smallest oblique angle 51, as shown inFIG. 3 . It is not essential that the elevations for eachnozzle 21 differ. For example, the distance to bit 25 may differ between only two of thenozzles 21, or all of the elevations could be the same. - Referring again to
FIG. 2 , a check valve 57 may optionally be inserted into an upper portion ofaxial passage 41. Check valve 57 may be of various types. In this example, a check valve element is biased by a spring 59 against a seat in a cartridge 61. Cartridge 61 rests on a shoulder in the upper portion ofaxial passage 41, which is slightly larger in diameter than the central portion that is intersected bynozzle passages 45. Check valve 57 allows down flow of fluid inaxial passage 41, but blocks upward blow. When runningdrill string 13 into the well bore 11,check valve 53 resists silt and cuttings from passing upward through bit outlets 31 tomud motor 15, where damage may occur. - Referring to
FIGS. 4-6 , eachnozzle 21 may havehelical grooves 63 formed in its bore oroutlet 64.Grooves 63 spiral from one end to the other ofoutlet 64. The helical angle may vary. Also,FIG. 4 shows that the outer end of eachnozzle 21 may have aconical recess 65 that diverges outward. Eachnozzle 21 has an O-ring seal groove 67 on its outer diameter for sealing within nozzle passage 45 (FIG. 2 ).Nozzles 21 may be retained in various conventional manners. Aretainer ring shoulder 69 receives a snap ring to retainnozzle 21 in this example. - Referring to
FIG. 7 , substantially the entire exterior offluid diverting sub 19′ may have protrusions ordimples 71 formed therein.Dimples 71 serve to enhance turbulence of drilling fluid flowingpast sub 19′. - In operation,
fluid diverting sub 19 is secured intodrill string 13 betweendrill bit 25 andmud motor 15. Alternately,fluid diverting sub 19 may form an upper part ofdrill bit 25. If the operator wishes to testmud motor 15 before lowering the string into well bore 11, and iffluid diverting sub 19 is connected betweenmud motor 15 anddrill bit 25, the operator will install blank plugs innozzle passages 45 in place ofnozzles 21. The blank plugs allow the operator to pump drilling fluid throughmud motor 15 and out bit outlets 31 to test whethermud motor 15 properly rotatesdrill bit 25. - After testing, the operator installs
nozzles 21 influid diverting sub 19. The operator can select different diameters for the bores of divertingnozzles 21 so as to create a desired flow area ratio to the bit nozzles or outlets 31. The total flow areas of the divertingnozzles 21 will be fairly small relative to the total flow areas of the bit outlets 31. Typically, the cumulative diverting nozzle flow area will be only 10 to 20 percent of the cumulative flow area of bit outlets 31. - Once the
nozzles 21 are installed, the operator lowers thedrill string 13 into well bore 11. When reaching the bottom of well bore 11, the operator rotatesdrill bit 25 to begin drilling while also pumping drilling fluid downdrill string 13. Blades orstabilizers 17 engage a wall of the well bore 11 to stabilize thedrill string 13. The operator can rotatedrill bit 25 by rotatingdrill string 13 from the drilling rig. The operator can also holddrill string 13 stationary, and the drilling fluid flowing throughmud motor 15 will rotatedrill bit 25 andfluid diverting sub 19 in unison with each other. When drilling horizontal wells, the operator may use both procedures at various times.Mud motor 15 is optional for certain drilling operations, such as vertical portions of the well. In those instances,mud motor 15 may be eliminated andfluid diverting sub 19 may connect to a lower end ofdrill string 13, such as the drill collars. - The drilling fluid flows into
bit cavity 33 and out bit outlets 31. The drilling fluid returns back up the annulus surroundingdrill string 13, bringing earth formation cuttings. A portion of the drilling fluid is diverted out through divertingnozzles 21. The upward and outward directed drilling fluid mixes with the returning drilling fluid discharged from bit outlets 31, creating turbulence and enhancing the retention of cuttings in the flow stream. The jets of drilling fluid exitingfluid diverting nozzles 21 will swirl due to the helical grooves 63 (FIG. 4 ). - Referring to the alternate embodiment of
FIG. 8 ,stabilizer sub 73 has atubular body 75 for connection into a drill string.Tabular body 75 defines a longitudinal axis 76 that extends through an interior axial passage (seeFIG. 2 ) provided for conveying drilling fluid through thetubular body 75. -
Several blades 77 are secured of formed on the exterior ofbody 75 for engaging a borehole wall for stabilizing a drill string.Blades 77 are radially spaced and protrude radially form an exterior surface ofbody 75 such that openexterior flow channels 77′ are defined between theblades 77.Blades 77 may be inclined relative to the axis 76, as shown inFIGS. 8-10 , or they may be parallel to the axis 76, as illustrated inFIG. 1 .Blades 77 may be straight or curved.Stabilizer sub 73 has an internally threaded box orupper end 78 for connection to a drill string member. In this embodiment,stabilizer sub 73 also has an internally threaded box orlower end 79 that is located a short distance from the lower ends ofblades 77. The lower ends ofblades 77 are all located the same distance above thelower end 79 ofbody 75 in this example. The upper ends ofblades 77 are all located the same distance belowupper end 78. The distance fromlower end 79 to the lower ends ofblades 77 is shown much smaller than the distance from the upper ends ofblades 77 toupper end 78, but the distances could be the same. - A
fluid diverting sub 81 has atubular body 83 with a plurality of fluid diverting ports ornozzle outlets 85.Tubular body 83 defines alongitudinal axis 84 that extends through an interior axial passage (seeFIG. 2 ) provided for conveying drilling fluid through thetubular body 83.Nozzle outlets 85 are in fluid communication with the interior axial passage through a Respective fluid diverting nozzle passage (seeFIG. 2 ) and point upward and outward to discharge a portion of the drilling fluid being pumped down the drill string.Nozzle outlets 85 may be constructed and oriented the same asnozzles 21 a, 21 b and 21 c inFIG. 1 . Three ormore nozzle outlets 85 are preferably used insub body 83. -
Sub body 83 has an upper externally threadedpin 87 that secures to the internally threadedlower end 79 ofstabilizer sub 73.Sub body 83 has a lower externally threadedpin 89 that secures to another component of the drill string.Flats 91 may be formed on the exterior ofsub body 83 for engagement by a wrench to apply torque to securesub 81 tostabilizer sub 73. When secured asassembly 92 shown inFIG. 9 , the axial distance from theuppermost nozzle outlet 85 to the lower ends ofblades 77 is quite small, such as three to five inches. - Commercially available stabilizers typically have an externally threaded pin on the lower end, rather than an internally threaded end. Since the externally threaded pin of a commercially available stabilizer would protrude some distance into a sub coupled below the commercially available stabilizer,
nozzle outlets 85 provided the sub coupled below the commercially available stabilizer would typically need to be provided at a location below the threaded pin of the commercially available stabilizer. Also, the distance from the upper end of the threaded pin to the lower ends of the blades is farther normally than the distance from internally threadedlower end 79 to the lower ends of theblades 73.Stabilizer sub 73 may be formed by cutting off the lower threaded pin of a commercially available stabilizer and machining an internally threadedlower end 79. Alternately,assembly 92 ofFIG. 9 could be integrally formed from a single tubular body. - A radially spacing of the
nozzle outlets 85 and corresponding diverting nozzle passages may correspond the radial spacing exhibited by theexterior flow channels 77′ such that drilling fluid discharged from thenozzle outlets 85 is directed toward theexterior flow channels 77′ in some embodiments. Discharging drilling fluid from thenozzle outlets 85 and directing the discharged drilling fluid through theexterior flow channels 77′ facilitates the return of drilling fluid at least by dislodging debris or sediments that accumulates between theblades 77. In some embodiments, each of thenozzle outlets 85 defines a nozzle axis that points upward and outward and also at an oblique angle relative to a vertical plane of the body axis that intersects the nozzle axis at the nozzle outlet in a manner similar tonozzles 21 described above with reference toFIGS. 2 and 3 . The plurality ofblades 77 are inclined, in some embodiments with respect to thelongitudinal axes 76, 84 in the direction of the oblique angle of thenozzle outlets 85. - One manner of utilizing
assembly 92 is illustrated inFIG. 10 . Drill bit 93 is secured to a fluid diverting sub 95 havingnozzles 96 that may be the same asfluid diverting sub 19 ofFIG. 1 . Amud motor 97, which may the same asmud motor 15, except it may lack stabilizer blades, may be secured to the upper end of fluid diverting sub 95. Fluid diverting sub 95 may have a float or check valve similar to valve 37 (FIG. 2 ) to impede debris from flowing intomud motor 97 when the drill string is being lowered into the borehole. Other tubular members such as a drill pipe or drill collar may be provided in addition to or as an alternative tomud motor 97 in some embodiments. During drilling, some of the drilling fluid being pumped down the drill string diverts out stabilizersub nozzle outlets 85 to enhance flow of fluid and cuttings betweenblades 77. The discharged fluid retards cuttings and debris packing betweenblades 77 keeping theexterior flow channels 77′ relatively clear. The proximity of thenozzle outlets 85 to theflow channels 77′ allows the fluid discharged from the nozzle outlets to retain sufficient energy to clean thechannels 77′. The velocity and force of the fluid discharged from thenozzles 85 facilitates cleaning of thechannels 77′ by generating turbulence in the annular flow of drilling fluid returning to the surface. The proximity of thenozzle outlets 85 to theflow channels 77′ ensures that the turbulence is maintained as the drilling fluid passes the through theflow channels 77′, and thereby facilitates cleaning theflow channels 77′. Additional drilling fluid is also diverted throughfluid diverter nozzles 96 just above bit 93 in the same manner as discussed in connection withfluid diverter 21 inFIG. 1 . - Referring to
FIG. 11 ,stabilizer 99 has atubular body 101 defining alongitudinal axis 102. An interior axial passage (seeFIG. 2 ) extends through thetubular body 101 for conveying drilling fluid therethrough. Thestabilizer 99 includesblades 103 that may be the same asblades 77 ofFIG. 8 .Exterior flow channels 103′ are defined between theblades 103. In this example, the axial lengths ofblades 103 are much closer to the overall length ofbody 101 than the lengths ofblades 77 relative tobody 75 ofFIG. 8 . A number of ports ornozzle outlets 105 are formed in an exterior surface ofbody 101. Thenozzle outlets 105 are in fluid communication with the interior axial passage through a respective fluid diverting nozzle passage (seeFIG. 2 ).Nozzle outlets 105 may be constructed and positioned relative to each other in the same manner asnozzles 21 ofFIG. 1 . Each of thenozzle outlets 105 is longitudinally positioned between upper and lower ends ofblades 103. Optionally anozzle outlet 105 may be located between each of theblades 103. As illustrated inFIG. 12 , a lowermost nozzle outlet 105 a may be disposed between twoblades 103 near the lower ends ofblades 103. A nextupward nozzle outlet 105 b may be located between twoblades 103 about midway along the longitudinal lengths ofblades 103. Anuppermost nozzle outlet 105 c may be located between two of theblades 103 near the upper ends ofblades 103. More than threenozzles 105 may be employed. -
Stabilizer 99 is illustrated as having an internally threaded lower end orbox 107.Stabilizer 99 may have an externally threaded upper end orpin 109. The upper ends ofblades 103 are quite close to the base of upper threadedend 109, such as less than two inches. The Lower ends ofblades 103 may also be less than two inches from internally threadedlower end 107. -
FIG. 12 illustrates one arrangement wherestabilizers 99 may be utilized in a drill string. Internally threadedlower end 107 of a lowermost stabilizer 99 a is secured to the external threaded pin of a bit 111. One ormore drill collars 113 extend upward fromlowermost stabilizer 99 b.Drill collars 113 are sections of drill pipe with a greater weight and wall thickness than the remaining sections of drill pipe. A nextupward stabilizer 99 b secures to the upper end of the drill collar orcollars 113 connected to stabilizer 99 a. An adapter can connect between lower internally threaded end 107 (FIG. 11 ) and the upper box end ofdrill collars 113. Alternately,stabilizer 99 could be manufactured with an integral threaded pin on the lower end, similar to pin 89 of diverter sub 81 (FIG. 8 ).FIG. 12 also shows another stabilizer 99 c mounted to drillcollars 113 extending upward fromstabilizer 99 b. Stabilizer 99 c may be constructed the same asstabilizers 99 a and 99 b. Fewer ormore stabilizers 99 than three may be used. InFIG. 12 , a mud motor isn't used, but it could be. For example, a mud motor may be provided in the drill string tin the place of one of thedrill collars 113. - While the disclosure has been shown in only a few of its forms, it should be apparent to those skilled In the art that it is not so limited but is susceptible to various changes without departing from the scope of the disclosure.
Claims (18)
1. An apparatus for facilitating the return of drilling fluid through an annulus surrounding a drill string, the apparatus comprising:
a longitudinal body defining an upper end, a lower end and a longitudinal axis extending therebetween, the upper and lower ends including connectors for connecting the longitudinal body into the drill string;
an interior axial passage extending between the upper and lower ends through the longitudinal body tor conveying drilling fluid therethrough;
a plurality radially spaced blades protruding from an exterior surface of the longitudinal body and defining open exterior flow channels therebetween; and
a plurality diverting nozzle passages extending between the inner axial passage and respective nozzle outlets on the exterior surface of the longitudinal body, the nozzle outlets exhibiting a radial spacing corresponding to a radial spacing of the exterior flow channels such that drilling fluid discharged from the diverting nozzle passages is directed toward the exterior flow channels.
2. The apparatus according to claim 1 , wherein each diverting nozzle passage is oriented upward and outward with respect to the longitudinal axis.
3. The apparatus according to claim 2 , wherein each of the each of the nozzle outlets is longitudinally spaced from the plurality of blades and disposed below the plurality of blades.
4. The apparatus according to claim 3 , wherein the longitudinal body comprises:
a stabilizer sub supporting the plurality of radially spaced blades thereon and including a first sub connector at a lower end thereof; and
a first fluid diverting sub having a second sub connector at an upper end thereof for coupling to the first sub connector of the stabilizer sub, the first fluid diverting sub supporting the plurality of diverting nozzle passages.
5. The apparatus according to claim 4 , wherein the first sub connector of the stabilizer sub comprises an internally threaded box for receiving a threaded pin comprising the second sub connector of the fluid diverting sub.
6. The apparatus according to claim 4 , wherein a longitudinal spacing between an uppermost nozzle outlet and a lower end of the plurality of blades is in the range of three to five inches.
7. The apparatus according to claim 4 , wherein the longitudinal body further includes a mud motor coupled to a lower end of the first fluid diverting sub and a second fluid diverting sub coupled to a lower end of the mud motor.
8. The apparatus according to claim 1 , wherein at least one of the nozzle outlets has a longitudinal position along the longitudinal body between upper and lower ends of the radially spaced blades.
9. The apparatus according to claim 1 , wherein the blades are inclined with respect to the longitudinal axis.
10. The apparatus according to claim 1 , wherein the plurality of radially spaced blades and the plurality of diverting nozzle passages are integrally formed together on a single tubular body.
11. A well drilling apparatus, comprising:
a body defining a longitudinal body axis, and including a threaded upper end for connection into a drill string and a threaded lower end for connection and rotation with an earth boring bit;
an axial passage in the body for conveying drilling fluid to an outlet in the earth boring bit;
a plurality of blades extending radially outward from an exterior surface of the body and radially spaced to define exterior flow channels therebetween, the plurality of blades configured for engaging a wall of a borehole formed by the earth boring bit; and
a plurality of nozzles outlets defined on the exterior surface of the body and in fluidic communication with the axial passage, each of the nozzle outlets having a longitudinal position along the body between upper and lower ends of the radially spaced blades.
12. The apparatus according to claim 11 , wherein each of the nozzle outlets defines a nozzle axis that points upward and outward and also at an oblique angle relative to a vertical plane of the body axis that intersects the nozzle axis at the nozzle outlet.
13. The apparatus according to claim 12 , wherein the plurality of blades is are inclined with respect to the longitudinal axis in the direction of the oblique angle.
14. The apparatus according to claim 11 , wherein at least one nozzle outlet is positioned within in each of the exterior flow channels defined between the blades.
15. The apparatus according to claim 11 , further comprising a tubular member coupled to a lower end of the body, wherein the tubular member comprises at least one of a mud motor, a drill pipe and a drill collar.
16. A method of drilling a well, the method comprising:
(a) providing a drill string having an earth boring device at a lower end thereof, the drill string having a body coupled therein that defines a longitudinal axis, the body including a plurality of blades extending radially outward from an exterior surface of the body, a plurality of nozzle outlets defined on the exterior surface of the body between the blades, and an axial passage extending through the body and in fluidic communication with each of the nozzle outlets;
(b) lowering the drill string into the well and rotating the earth boring device;
(c) pumping drilling fluid down the drill string into the axial passage of the body, conveying a first portion of the drilling fluid through the axial passage and discharging the first portion of the drilling fluid through an outlet defined in the earth boring device into an annulus surrounding the drill string; and
(d) diverting and discharging a second portion of the drilling fluid from the axial passage in the body through the plurality of nozzle outlets into the annulus.
17. The method of claim 16 , further comprising:
(e) engaging a wall of the annulus with the plurality of blades to stabilize the drill String.
18. The method of claim 16 , wherein step (a) comprises providing the drill string with a tubular member coupled therein, the tubular member comprising at least one of a mud motor, a drill pipe and a drill collar, and providing the body in the drill string above the tubular member.
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US13/794,098 US20130233620A1 (en) | 2012-03-09 | 2013-03-11 | Stabilizer with Drilling Fluid Diverting Ports |
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US201261608755P | 2012-03-09 | 2012-03-09 | |
US13/794,098 US20130233620A1 (en) | 2012-03-09 | 2013-03-11 | Stabilizer with Drilling Fluid Diverting Ports |
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US10087686B2 (en) * | 2015-06-04 | 2018-10-02 | Sandvik Intellectual Property Ab | Shank adaptor with strengthened flushing hole |
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US11408230B2 (en) | 2017-10-10 | 2022-08-09 | Extreme Technologies, Llc | Wellbore reaming systems and devices |
US11491594B2 (en) * | 2018-01-08 | 2022-11-08 | Ford Motor Company | Tooling assembly with internal coolant passages for machines |
US20190323311A1 (en) * | 2018-04-24 | 2019-10-24 | Saudi Arabian Oil Company | Method to Mitigate a Stuck Pipe During Drilling Operations |
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